linux-kernel - [PATCH 2/3] x86/asm: add _ASM_BYTES() macro for a .byte ... opcode sequence

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Message-Id: <20210510090940.924953-3-hpa@zytor.com>
Date:   Mon, 10 May 2021 02:09:39 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 2/3] x86/asm: add _ASM_BYTES() macro for a .byte ... opcode sequence

From: "H. Peter Anvin (Intel)" <hpa@...or.com>

Make it easy to create a sequence of bytes that can be used in either
assembly proper on in a C asm() statement.

Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
---
 arch/x86/include/asm/asm.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index c80899ac0192..1a1e22297867 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -13,6 +13,8 @@
 # define __ASM_FORM_COMMA(x, ...)	" " __stringify(x,##__VA_ARGS__) ","
 #endif
 
+#define _ASM_BYTES(x, ...)	__ASM_FORM(.byte x,##__VA_ARGS__ ;)
+
 #ifndef __x86_64__
 /* 32 bit */
 # define __ASM_SEL(a,b)		__ASM_FORM(a)
-- 
2.31.1